Don't beat yourself up over past actions, just learn from your mistakes. You can't wish what was, and Bitcoin couldn't be a currency unless you actually use it sometimes...(same with other crypto.)
I purchased some hotel rooms with BTC when it was worth just a few hundred bucks. I don't mind one bit, because I had a great time in those hotel rooms. ;-)
Keep your eyes out and trust your instincts. This cryptotrain is just getting started. $15k for BTC is nothing...just wait till you see where it goes. (BTC will probably NOT be the highest return from here on out.)
I tend to not beat myself up over it too much, though there will of course always be some amount of regret. Ultimately however I used the currency for a good purpose and helped spur it along in the very early days. People spending the currency (and accepting the currency!) is what helped get it to where it is today.
And other cryptocurrencies have become a thing as a result of the success of Bitcoin. I am currently mining Gridcoin because I love the idea of a cryptocurrency that possesses an inherent value. My GRC wasn't born simply by burning electricity to complete some hash, but rather as the result of completing very real scientific data. This is the coin that I can see (and hope to see) being the next big thing, or something like GRC. Admittedly there is some bias in my saying this.
That said I'd really like to see an unbiased comparison of GRC with similar coins.
Lastly, I apologize for getting back to you so late. Being a newbie on this site I wasn't aware that I had responses.
edit: That was a fun typo, but it had to be fixed.